Apply suggestions from code review

Author: gnikit

setup.cfg

@@ -13,7 +13,6 @@ classifiers =
     Topic :: Software Development :: Quality Assurance
     License :: OSI Approved :: GNU General Public License v3 (GPLv3)
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
@@ -29,7 +28,7 @@ project_urls =
 
 [options]
 packages = find:
-python_requires = >= 3.5
+python_requires = >= 3.6
 install_requires =
     configargparse
     importlib-metadata; python_version < "3.8"